Sharpening and setting device for scraper-blades.



. J. MIOTKE. SHAB-PBNING AND SETTING DEVICE FOR SCBAPEB BLADES.

APPLICATION FILED JUNE 29, 1907. 968, 1 80. Patented Aug. 23, 1910.

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J. MIOTKE.

SHARPBNING AND SETTING DEVIGE r011 SGBAPBR BLADES.

APPLIOATION FILED JUNE 29, 1907.

Patented Aug. 23, 1910.

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J. MIOTKE.

SHABPENING AND SETTING DEVICE r013 scmrmv BLADES.

APPLICATION FILED JUNE 29, 1907. 968, 1 80. Patented Aug. .23, 1910. t.

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UNITED SATE$ PATENT OFFICE.

JOSEPH IvIIOTKE, OF MILWAUKEE, WISCONSIN.

SHARPENING AND SETTING DEVICE FOR SCRAPERFBLADES.

To all whom "it may concern:

Be it known that I, JOSEPH MIOTKE, of Milwaukee, \Visconsin, have invented a Sharpening and Setting Device for Scraper- Blades, of which the following is a specification.

The ordinary fioor-scraper as at present in use, has, as is well understood, a blade whose cutting edge is directed at an angle, ordinarily a right angle, to the plane of the blade itself; in other words, it has What is known as a turned edge. The sharpened edge of the scraper, which is turned at an angle to the plane of the blade, is only a minute fraction of an inch in width, and therefore cannot be formed once for all upon the blade, since it soon becomes worn off in use and requires to be re-formed; and for this purpose it is necessary to first sharpen or edge the blade in the original plane thereof, and then to turn said sharpened edge, without dulling the same, to the requisite angle. Practice has shown that this is a most difficult operation, requiring the utmost skill in order to get a perfectly smooth and evenly directed edge Without chipping otf little pieces, or dulling it; and that to form this edge with the ordinary tools is entirely beyond the skill of the ordinary workman employed to use the scraper. Now as the scraper-blade requires frequent resharpening, and as the scrapers them selves are frequently, or rather to say generally, used far from any machine-shop, perhaps hundreds of miles from a place where skilled workmen could be procured to sharpen the blades, it is impracticable to provide the worker with an extra supply of blades, and as the workmans own skill is almost invariably insufficient to form a proper edge upon the blade which will enable satisfactory work to be done, this has amounted in a majority of instances hithcrto to a practical prohibition of the use of the scraper altogether in planing and smoothing fioors after being laid.

It is the object of this invention to overcome these difficulties by providing an apparatus by which scraperblades at all times can be sharpened by any one, without any expert skill or knowledge of the subject, and thus bring the sharpening process within the reach of the average workman; thereby in turn widely extending the use of the wheeled floor-scraper (a device of very Specification of Letters Patent.

Application filed June 29, 1907.

Patented Au 23, 1910.

Serial No. 381,558.

recent origin) over a field of use many times as large as at present.

I further aim to provide such a device as will enable scraping-blades to be sharpened not only by unskilled labor, but also in a period of time (amounting to 4 or 5 minutes) insignificant in comparison with that which is required when they are sharpened as usual heretofore, thus saving a vast amount of time to the workmen employed, since these blades require very frequent sharpening in order to do good work. And I further aim to produce such a device as will, besides accomplishing the object hereinabove mentioned, enable an edge far more perfect and smooth, sharp and regular, to be produced upon the scraper blades, than is possible in carrying out the ordinary method of sharpening.

I accomplish these objects by providing a frame consisting of two main parts, either of which may be stationary and the other rotatable about an axis with respect to the first; the one being a clamping device for holding blades during the sharpening and edge-turning operations, and the other a set of guides arranged to hold the tools in the proper position, or rather in a series of positions which are successively occupied in different stages of the process of forming the edge.

My invention can best be understood from a consideration of an exemplar or embodiment thereof, although it is to be understood that it may be embodied in a great number of forms involving the same principles. For the sake of illustration however I have shown in the accompanying drawings two of such forms which the invention may assume, these being hereinafter particularly described.

In these drawings, Figure 1 is a front view of one form of my device, showing the file and holder in position for use and in section on the plane 1 of Fig. 2. Fig. 2 is an end elevation thereof from the right of Fig. 1, illustrating also the first or filing operation and the first position of the blade. Fig. 3 is a -transverse median section through the same, illustrating the second or grinding operation, by means of which a sharp edge is put upon the blade; Fig. fl: is a transverse median section through the scraper, showing the blade in the third position, and illustrating the second step of the edge-turning process; Fig. 5 is likewise a transverse median section through the scraper, but showing the blade in the fifth position and illustrating the fourth and last step of the edge-turning process; Flg. 6 isa transverse section through the scraper on the plane 6 of Fig. 1, showing the realining or final step of the edge-turning process, the blade being in the sixth position. In Figs. 3, 4t, 5 and 6 a part of the clamping-arm is shown as broken away. Fig. 7 is afragmentary view illustrating on a much enlarged scale the realining process and position of the tool. Fig. 8 is a longitudinal central section through the fileguide or bridge and file holder, the file being shown in elevation. Fig. 9 is a fragmentary section on a much enlarged scale, through one side of the scraper on the plane 9 (see Fig. 4) looking toward the rear face thereof. Fig. 10 is a front view of the second form of scraper. Fig. 11 is an end View thereof from the right of Fig. 10; Fig. 12 is a transverse section thereof on the plane 12; Fig. 13 is a perspective view of the filing-slide or bridge; and Fig. 14: is a perspective view of the file-holder.

In these drawings every reference character refers always to the same part.

The device as shown in the first form consists of a main frame-piece A having a flat base-plate a at whose extremities are up right standards a with a pair of clamping arms a which extend around the edge of a table or work-bench B on which the device is mounted and are adapted to clamp it firmly thereto by means of clamping-screws (13 provided with abutment pieces a loosely mounted on their ends, said clamping screws being screwed up firmly to the under side of the table or bench B. Instead of the clamping-arms or screws, any other suitable means may be substituted for attaching the member A permanently or reinovably to the table or bench B and is consistent with my invention.

The standards a are provided with screw bosses a" receiving pivot screws a whose ends a are reduced to form bearings for the hubs c of the rotatable member C which is pivoted upon said screws. Said member C has an oblique upper surface to which is clamped the scraper-blade D which is to be sharpened, by'means of a clamping-plate E and cap screws 6, provided with washers e and passing through holes in the plate E and engaging threaded sockets in the member C as clearly shown in Fig. 3. The screws 6 do not pass through holes in the scraper-blade D but through slots cl which are generally provided in such blades for setting them in the scraper to permit of the blade being adjusted to take up wear. This enables the blade to be likewise moved forward in the holder as it becomes worn down by frequent resharpening. To enable it to be Set rapidly and correctly to project the proper amount, I may provide a pair of adjusting screws 0- provided with milled heads 0 and turning in threaded lugs 0* on the holder C.

The standards a of the member A are provided at their upper corners with projecting lugs a to which are secured a pair of longitudinal curved guide-bars (0 by means of screws (4 or in any other suitable fashion. The guide-bars are parallel and connect the two standards at the front and back, and they are made curved to fit the proper curvature of the working-edge of the scraper blades.

Between the projecting lugs a? of the standards a the upper edge of the latter is made on a circular arc a from the pivot a as a center, and is indented with a plurality of notches (4 in this case six in number, though a different number may be used if thought desirable. These notches may, for convenience of setting the blade-holder, be numbered from 1 to 6, as in Fig. '2. Cooperating therewith is a pin 0 (Fig. 9) mounted on the end of a plate-spring 0 which is secured at its opposite end by a screw 0 to the inner face of the flange c of the member C; one of these devices being preferably provided at each end of the blade-holder, so that both ends may be held rigid and the holder prevented from yielding. The pin passes through a hole 0 in the flange 0, and projects into one of the notches a from which it is disengaged by simply pressing it in with the finger. In this manner the blade-holder may be readily set in any one of the positions corresponding with the notches 1 to 6.

In connection with the device as above described, there is used a sliding-bridge F which is used as a guide for the file in the important operation of beveling the edge of the blade in the initial operation of sharpening. This member is shown in perspective in Fig. 13. It has a pair of side-flanges 7" which are properly spaced to fit on the outer side of the guide-rails a and rectangular projections f in the corner form seats or rests which abut on the upper faces of the rails and slide thereon. The side-flanges f are connected by cross-flanges 7, the distance apart of which corresponds with the spacing of the rails g of the file-holder G, which is shown separately in perspective in Fig. 1 1. It is to be understood that the inner faces of the flanges f are properly spaced to receive the bars 9 between them without any unnecessary lateral motion or wabbling, and in this position the bars 9' rest upon four raised rectangular projections f at the corners of the member F while between these projections the flanges f are cut away as shown at to leave room for the file H, as will be best understood considering Fig. 1, which shows an endview of the sliding-bridge and a cross-section of the file and file-holder in position therein. The latter consists of a pair of transverse end-blocks g united by the bars 9, and slotted out at g to receive the file H, which passes therethrough and is clamped in place by set-screws 9*. It will be observed that the lower faces of the slots 9 are below the bars g so that the active face of the file passes below said rods and the latter in consequence never come in contact with the edge of the scraper blade.

In addition to the device thus far described, the sliding-bridge F, file-holder G, and file H, I employ in connection with the sharpening and setting operation a whetstone or oilstone I (Fig. 3) and a special setting tool J (Figs. 4 to 7). The tool J comprises, in its preferred form, a turned handle j, a cylindrical steel pin j set therein, and a flanged roller j which has lateral flanges y adapted to fit the guide-bars a and roll theregtn. The pin j has a conical point j as shown, which is used in the final or realining operation of blade-setting.

The operation of sharpening and setting the blade is as follows: The blade being set up in the holder C and suitably adjusted therein by means of the screws 0 and the holder being in the first position (shown in Figs. 1 and 2) the slide-bridge F placed upon the rails a, and the file H fitted in the file holder G, the operator then places the file and holder between the longitudinal flanges f of the bridge and reciprocates the file longitudinally in the ordinary manner of filing, moving it slowly along the edge until the blade is filed down substantially to the point where the file is moved without further action thereon. Then the edge is smoothed by a draw-filing operation the file and bridge being moved along the rails (0 without moving the file in the bridge. This serves to give greater smoothness to the filed edge. After this the oilstone I is used in the manner shown in Fig. 3 (the holder C remaining in the first position) grinding off the bevel edge, and should then also be used upon the flat edge of the blade, so as to leave the blade perfectly smooth and fiat. The next thing is to set the edge by turning it evenly and smoothly until it is directed at approxis mately a right angle to the plane of the blade. Placin the holder C successively in the second, third, and fourth positions the tool J is used in the manner shown in Fig. 4:, heavy pressure being brought to bear upon the pin 7' and the tool being moved evenly back and forth along the guide-bar a on which rests the roller 7' In each position of the holder C the edge is turned a little farther over than in the preceding position.

On reaching posit-ion 5, the tool J is turned in reverse direction so that the roller rests upon the rear guide-bar a instead of the front one, as shown in Fig. 5. This should complete the edge-turning operation, unless it is thought desirable to continue it still farther in position 6; it being understood of course that the number of positions used will depend largely upon the angle to which the edge is to be turned, that is, upon the angular position of the blade in the particular scraper for which it is desired to use it.

After the edge is turned by the tool J in the manner aforesaid, it will not be entirely fit for use, because the edge will be found slightly uneven and Waving, so that it would cut grooves in the floor and remove ragged shavings therefrom. It is therefore restored to a smooth and even condition by the use of the point 7' of the tool J, as shown in Fig. 6, and on a larger scale in Fig. 7. The point 7' is moved back and forth immediately under the edge and pressing upwardly thereupon and the irregularity thereof ironed out, so to speak, the edge being then perfectly smooth and ready for use and without having any of its original ke-enncss destroyed.

After a little practice one may sharpen a scraper-blade in the above manner in the space of four or five minutes, a few strokes 1n each direction and in each position of the several tools being usually all that is necessary.

The second form of my invention, shown in Figs. 10 to 12, has a stationary framemember K, which has a fiat base is and an oblique upper face k receiving the scraperblade D and clamping-blade E in the manner described in connection with the first form, said face 10 being provided with the adjusting-screws c and supported and rigidified by side-flanges The base 70 is in this instance not provided with clamps, but is instead slotted transversely as shown'at 70* to receive lag-screws I0 screwed into the table or work-bench B. The side-flanges k are bored and threaded to receive the ends of pivot-screws m, the shank of which pivotally supports the hubs m of two yokes M M which are at the opposite ends of the member K and have diverging arms m con nected by longitudinal guide-rails m in the same manner as the projections a and rails a in the first form. One of the two yokemembers, as shown the member M has also a depending arm m at the end of which is set a spring-pin m in a socket m, which is internally bored to receive a spring m (as shown in dotted lines in Fig. 10) by which this pin is pressed inwardly to enter one of a series of holes is, in a sector-shaped flange or extension 70 on the member K. These holes take the place of the notches a in the first form, and may be numbered 1 to 6 as shown in Fig. 11. The arm m may be provided with a pointed extension m which acts as an index. In this case the first position of the yoke is shown in full lines and the last position in dotted lines in Fig. 11. This form has perhaps the advantage over Fig. 1, that the blade can be held somewhat more rigidly, and perhaps a disadvantage in the fact that the setting-tool is not held always horizontal. The mode of operation is the same in both cases.

From the description of these two forms others will doubtless present themselves to those skilled in the art and to the average mechanic, and of course I consider all such modifications as lying within the scope of my invention so far as they fall within a reasonable construction of my claims.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent is:

1. An edge turning device comprising, in combination, a blade-holder adapted to hold a scraper-blade, a guide-bar parallel to the edge of said scraper-blade, and an edgeturning tool having flanges engaging said guide-bar and adapted to be guided thereby lengthwise of the blade and in position to press laterally upon the edge of said blade and thereby turn the same.

2. An edge-turning device comprising, in combination, a blade-holder adapted to hold a scraper-blade, a tool-guide adapted to guide a tool lengthwise of the blade over the edge of said blade; said holder having a series of successive positions with respect to said guide at intervals between that in which the tool lies parallel to the unturned edge and that in which it lies parallel to the turned edge, in each of which positions the plane of said blade makes a more obtuse angle with the plane of the tool than in the preceding.

3. An edge-turning device comprising, in combination, a blade-holder, and a toolguide adapted to guide a tool over a definite surface in contact with the edge of the blade held by said blade-holder, said holder and tool-guide having a pivotal movement with respect to each other and one having a plurality of cavities corresponding to different relative positions of said guide and holder and the other having a member adapted to engage one of said cavities in each of the successive relative positions.

4. In an edge-turning device, in combination with a holder for a scraper-blade and a tool-guide, an edge-tnrning tool acting in connection with said guide and having a surface adapted to turn the edge of said tool when pressed laterally thereupon and a point adapted to take under the edge of the tool and realine and smooth the same.

5. An edge-turning device comprising, in combination, a base-member having a pair of uprights, a pair of parallel guide-bars connecting said uprights, a blade-holder pivoted to said uprights and movable between said guide-bars, and means for clamping a scraper-blade on said holder.

6. An edge-turning device comprising, in combination, av base-member having a pair of uprights, a pair of parallel guide-bars connecting said uprights, a blade-holder pivoted to said uprights and movable between said guide-bars, means for clamping a scraper-blade on said holder, and one or more adjusting screws adapted to abut upon the rear edge of the scraper-blade to adjust the proper position of the front edge thereof relative to said guide-bars.

7. An edge-turning device comprising, in combination, a base-member having a pair of uprights, a pair of parallel guide-bars connecting said uprights, a blade-holder pivoted to said uprights and movable between said guide-bars, means for clamping a scraper-blade on said holder, a series of cavities disposed in the arc of the circle about the pivot of said blade-holder upon one or both of said standards, and a pin or bolt on said blade-holder adapted to enter and engage said cavities successively in the successive angular positions of said holder.

8. An edge-turning device comprising, in combination, a frame consisting of yokes united by a pair of parallel guide-bars, and a blade-holder having means for securing a blade thereto; said two members being pivoted together so that the edge of the blade held by said holder may lie in various angular positions between said guide-bars.

9. An edge-turning device comprising, in combination, aframe consisting of yokes united by a pair of parallel guide-bars, a blade-holder having means for securing a blade thereto; said two members being pivoted together so that the edge of he blade held by said holder may lie in various angular positions between said guide-bars; and a spring-pin mounted on one member adapted to engage in one of a series of corresponding cavities formed in the other, whereby the two members may be adjustably locked in various angular positions.

In witness whereof, I have hereunto set my hand this 26th day of June 1907.

JOSEPH HIOTKE.

In presence of GEORGE VETMORE COLLES, MINNIE SOHIENBEIN. 

